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Gutcutter has attached these 5 pictures to aid in identification. The message is below.
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Page:12
PaulRobertsMay 7th, 2012, 11:04 am
Colorado

Posts: 1776		I've known pleuralis to be olive and vitreus to be yellower with an orange (sometimes quite bright) abdomen. I assume this is in females only but I don't remember.

As far as being certain, I guess they'd have to be keyed out.
EntomanMay 7th, 2012, 1:11 pm
Northern CA & ID

Posts: 2604
They are 9.5 mm. I pickled them and when I get some time, which will not be today I'll try and run them through the keys..

As far as being certain, I guess they'd have to be keyed out.

I'm not aware of any reliable keys for determining between the two species without male imagos. If you had them, size wouldn't help but vitreus has more prominent penes easily distinguishable from pleuralis and usually dark medial marks on the terga lacking on pleuralis. I'm pretty sure male duns aren't developed enough to show either trait with any clarity unless it's a really good closeup photo.

All we really have are the old angler's guidelines regarding duns:

1. Earlier, darker, tan & gray tinted - pleuralis

2. Later, lighter, yellow & orange tinted - vitreus

Frankly, I didn't notice the amberish hues on Tony's specimen and based my initial opinion on timing. The lighting is such in his photos that it looked dark enough to not raise an alarm about its shade either. I wasn't sure about Eric's which is why I left my comments about his photos at the genus level. After comparing the two more closely and taking into account the different lighting, its pretty obvious that Tony's and Eric's are the same species.

Good job, Paul. I have to agree with you that they are probably vitreus. So much for counting on timing this year, huh? :)
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
EntomanMay 9th, 2012, 4:18 pm
Northern CA & ID

Posts: 2604		Guys -

I'm embarrassed to admit another character completely overlooked - the pale tails! E. pleuralis has pretty dark ones. OOPs...
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Page:12

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